Added comments

src/app/home/home.component.ts

@@ -55,6 +55,7 @@ export class HomeComponent implements OnInit {
     this.getSamples();
   }
 
+  // Iterate through active keys to assemble an api request for the required data
   getSamples() {
     let query = '/samples?status%5B%5D=validated&status=new&filters%5B%5D=%7B%22mode%22%3A%22in%22%2C%22field%22%3A%22material.group%22%2C%22values%22%3A%5B';
     let temp = '';
@@ -79,7 +80,7 @@ export class HomeComponent implements OnInit {
         }
       });
     }
-    const datasets = this.updateGraph();
+    this.updateGraph();
   }
 
   // preset select